Blah, I forgot about county registrations. Once your religion is filed with the state, individual clergy may have to inform their local/county clerk that they will be performing such ceremonies for weddings to be filed with the clerk's office. Basically, it's a way for the local government to maybe get a few bucks for the filing fee and know who is actually out there doing weddings in the area. If you are going to travel to some 3rd party location to marry people, you may have to inform the local clerk's office ahead of time. Again, because of constitutional rights, they basically can't say no and they can't press you for details of your faith or ceremony unless there is reason to believe it will involve criminal activities. They can make you fill out a form telling them who you are and charge $12 filing fee or whatever for administrative costs.
In Illinois, I once filed an official religion and was recognized for a couple years before we decided that the annual renewal forms were irrelevant to our essentially shamanistic purposes. We had to list 3 officers in the fashion of "president, vice-president, and treasurer" name and address stuff, much like a small corporation. We did not have to disclose or discuss anything of the content of our religion or practices, nor reveal anything about church finances or property. I think it cost under $50 to file the paperwork, and we were as official as any church/religion out there.
Under this religion, I and the treasurer got married at the president's kennel office while he was on his lunch break. The hardest/longest part was just filling in the forms and coming up with some fitting "vows" that referenced The Princess Bride a couple times. I got to be the Man in Black. At one point the kennel owner's sister showed up with a bag of Taco Bell lunch, so she got to attend it catered by accident. The whole thing was really pretty straightforward. Some jurisdictions require a couple witnesses to sign off that they actually saw the proceedings happen.
Shortly thereafter, I officiated the president's own wedding in his sister's back yard. The whole wedding party was geared in SCA-type medieval garb and weapons, so when I got to the part where I asked if anyone in the audience had just cause that the wedding should not happen, I added that they should think carefully because the party was prepared to repel boarders :)
Basically, in the USA, the government has no right to stifle your creativity or vision regarding such matters. All they can do is require you to fill out some forms so they know who is filing the paperwork, then they have to give you all the tax and insurance and inheritance rights due to adult citizens who make a consensual decision on their own merit. I'm back in Illinois again, so if I can help the cause in some way from here, just let me know. I've been titled as a monk, a priest, a pastor, a minister, an "elder" a couple times, and a shaman in various religions or spiritual organizations, some recognized by the state, some not. My totems think that having a "legal" relationship is a nonsensical assertion, given that relationships exist apart from anyone's supposed authority. Does the moon need a paper to allow it to orbit the earth? Do tooth and claw need permission to be sharp? Does the eagle need to register its ability to fly at will? Does the bear need a license to eat salmon? Do the valkyr wait for filing times to sort out the dead? Ha! The self-importance of human political affairs is the laughingstock of the cosmos.
Fear not, for CotFSM may openly recognize the silliness of appealing to the spirit world for worldly authority, but it is no less legitimate than those who pretend that such appeals mean anything after all. The sooner and deeper we penetrate the church-state liaison, the sooner we end it.
In case you didn't realize it, I DO have a sense of humor. How about you?
"I will not fear. Fear is the mind-killer... I will face my fear. I will let it pass over and through me, and when it has gone, only I will remain." --The Bene Gesserit
"Time is a spiral. Space is a curve. I know you get dizzy, but try not to lose your nerve." -- Neil Peart
"I'm not in the ship. I am the ship." -- River Tam
"The truth is simple. It's the lies that get complicated." -- me
"No matter where you go, there you are." --Buckaroo Banzai